EP 0887964 A2 19981230 - Filter selector
Title (en)
Filter selector
Title (de)
Filterwähler
Title (fr)
Sélecteur de filtres
Publication
Application
Priority
GB 9713575 A 19970626
Abstract (en)
In an optical telecommunications system using wave division multiplexing (WDM) a wavelength add-drop multiplexer (WADM) has an array of adjacently connected filters, each for selecting light of a respective wavelength being transmitted in a multiplexed data stream along an optical fibre, each of the array of filters being adjacently connected to a portion of the array which is a nominally transparent filter and having means for moving the array so that movement between filters in use occurs via the nominally transparent filter portion of the array. Further, in a method of operating a WADM the transition between two filters of an array of filters each for selecting light of a respective wavelength being transmitted in a multiplexed data stream along an optical fibre occurs by way of a nominally transparent filter portion of the array. <IMAGE>
IPC 1-7
IPC 8 full level
G02B 26/00 (2006.01); G02B 6/34 (2006.01); H04J 14/00 (2006.01); H04J 14/02 (2006.01)
CPC (source: EP US)
G02B 6/29368 (2013.01 - EP US); G02B 6/29383 (2013.01 - EP US); G02B 6/29395 (2013.01 - EP US); H04J 14/0201 (2013.01 - EP US)
Designated contracting state (EPC)
BE DE ES FR GB IE IT NL SE
DOCDB simple family (publication)
EP 0887964 A2 19981230; EP 0887964 A3 20040121; EP 0887964 B1 20060607; AU 5939298 A 19990107; AU 753905 B2 20021031; CN 1156097 C 20040630; CN 1204191 A 19990106; DE 69834772 D1 20060720; DE 69834772 T2 20070614; GB 2326785 A 19981230; GB 2326785 B 20020904; GB 9713575 D0 19970903; GB 9805245 D0 19980506; JP H1127239 A 19990129; NO 981153 D0 19980316; NO 981153 L 19981228; US 6181451 B1 20010130
DOCDB simple family (application)
EP 98301850 A 19980312; AU 5939298 A 19980319; CN 98106692 A 19980416; DE 69834772 T 19980312; GB 9713575 A 19970626; GB 9805245 A 19980313; JP 11263398 A 19980319; NO 981153 A 19980316; US 4061798 A 19980318